I had similar problem with my car recently. I can tell the oil is low when the litter tick at start takes too long to go away but I lent my car to somebody and i noticed the tick immediately.

I added a quart of oil and it didn’t even get to the “minimum” mark so clearly I wasn’t getting my low oil warning like my wife’s car does (where the oil light will come on for a few seconds when you turn off the engine).

I’m betting the oil level sensor is kaput.

I think it may also be the oil temp sensor which I can read with my scanner.

I’ve never tried to find the oil level reading with my scanner but will soon.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)